content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import com.google.protobuf.AbstractMessageLite.Builder.LimitedInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteBuffer;
  
  /**
   * A partial implementation of the {@link Parser} interface which implements
   * as many methods of that interface as possible in terms of other methods.
   *
   * Note: This class implements all the convenience methods in the
   * {@link Parser} interface. See {@link Parser} for related javadocs.
   * Subclasses need to implement
   * {@link Parser#parsePartialFrom(CodedInputStream, ExtensionRegistryLite)}
   *
   * @author liujisi@google.com (Pherl Liu)
   */
  public abstract class AbstractParser<MessageType extends MessageLite>
      implements Parser<MessageType> {
    /**
     * Creates an UninitializedMessageException for MessageType.
     */
    private UninitializedMessageException
        newUninitializedMessageException(MessageType message) {
      if (message instanceof AbstractMessageLite) {
        return ((AbstractMessageLite) message).newUninitializedMessageException();
      }
      return new UninitializedMessageException(message);
    }
  
    /**
     * Helper method to check if message is initialized.
     *
     * @throws InvalidProtocolBufferException if it is not initialized.
     * @return The message to check.
     */
    private MessageType checkMessageInitialized(MessageType message)
        throws InvalidProtocolBufferException {
      if (message != null && !message.isInitialized()) {
        throw newUninitializedMessageException(message)
            .asInvalidProtocolBufferException()
            .setUnfinishedMessage(message);
      }
      return message;
    }
  
    private static final ExtensionRegistryLite EMPTY_REGISTRY
        = ExtensionRegistryLite.getEmptyRegistry();
  
    @Override
    public MessageType parsePartialFrom(CodedInputStream input)
        throws InvalidProtocolBufferException {
      return parsePartialFrom(input, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return checkMessageInitialized(
          parsePartialFrom(input, extensionRegistry));
    }
  
    @Override
    public MessageType parseFrom(CodedInputStream input) throws InvalidProtocolBufferException {
      return parseFrom(input, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parsePartialFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      MessageType message;
      try {
        CodedInputStream input = data.newCodedInput();
        message = parsePartialFrom(input, extensionRegistry);
        try {
          input.checkLastTagWas(0);
        } catch (InvalidProtocolBufferException e) {
          throw e.setUnfinishedMessage(message);
        }
        return message;
      } catch (InvalidProtocolBufferException e) {
        throw e;
      }
    }
  
    @Override
    public MessageType parsePartialFrom(ByteString data) throws InvalidProtocolBufferException {
      return parsePartialFrom(data, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(ByteString data, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return checkMessageInitialized(parsePartialFrom(data, extensionRegistry));
    }
  
    @Override
    public MessageType parseFrom(ByteString data) throws InvalidProtocolBufferException {
      return parseFrom(data, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      MessageType message;
      try {
        CodedInputStream input = CodedInputStream.newInstance(data);
        message = parsePartialFrom(input, extensionRegistry);
        try {
          input.checkLastTagWas(0);
        } catch (InvalidProtocolBufferException e) {
          throw e.setUnfinishedMessage(message);
        }
      } catch (InvalidProtocolBufferException e) {
        throw e;
      }
  
      return checkMessageInitialized(message);
    }
  
    @Override
    public MessageType parseFrom(ByteBuffer data) throws InvalidProtocolBufferException {
      return parseFrom(data, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parsePartialFrom(
        byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      try {
        CodedInputStream input = CodedInputStream.newInstance(data, off, len);
        MessageType message = parsePartialFrom(input, extensionRegistry);
        try {
          input.checkLastTagWas(0);
        } catch (InvalidProtocolBufferException e) {
          throw e.setUnfinishedMessage(message);
        }
        return message;
      } catch (InvalidProtocolBufferException e) {
        throw e;
      }
    }
  
    @Override
    public MessageType parsePartialFrom(byte[] data, int off, int len)
        throws InvalidProtocolBufferException {
      return parsePartialFrom(data, off, len, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parsePartialFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return parsePartialFrom(data, 0, data.length, extensionRegistry);
    }
  
    @Override
    public MessageType parsePartialFrom(byte[] data) throws InvalidProtocolBufferException {
      return parsePartialFrom(data, 0, data.length, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(
        byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return checkMessageInitialized(
          parsePartialFrom(data, off, len, extensionRegistry));
    }
  
    @Override
    public MessageType parseFrom(byte[] data, int off, int len)
        throws InvalidProtocolBufferException {
      return parseFrom(data, off, len, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(byte[] data, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return parseFrom(data, 0, data.length, extensionRegistry);
    }
  
    @Override
    public MessageType parseFrom(byte[] data) throws InvalidProtocolBufferException {
      return parseFrom(data, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parsePartialFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      CodedInputStream codedInput = CodedInputStream.newInstance(input);
      MessageType message = parsePartialFrom(codedInput, extensionRegistry);
      try {
        codedInput.checkLastTagWas(0);
      } catch (InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(message);
      }
      return message;
    }
  
    @Override
    public MessageType parsePartialFrom(InputStream input) throws InvalidProtocolBufferException {
      return parsePartialFrom(input, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return checkMessageInitialized(
          parsePartialFrom(input, extensionRegistry));
    }
  
    @Override
    public MessageType parseFrom(InputStream input) throws InvalidProtocolBufferException {
      return parseFrom(input, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parsePartialDelimitedFrom(
        InputStream input, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      int size;
      try {
        int firstByte = input.read();
        if (firstByte == -1) {
          return null;
        }
        size = CodedInputStream.readRawVarint32(firstByte, input);
      } catch (IOException e) {
        throw new InvalidProtocolBufferException(e);
      }
      InputStream limitedInput = new LimitedInputStream(input, size);
      return parsePartialFrom(limitedInput, extensionRegistry);
    }
  
    @Override
    public MessageType parsePartialDelimitedFrom(InputStream input)
        throws InvalidProtocolBufferException {
      return parsePartialDelimitedFrom(input, EMPTY_REGISTRY);
    }
  
    @Override
    public MessageType parseDelimitedFrom(InputStream input, ExtensionRegistryLite extensionRegistry)
        throws InvalidProtocolBufferException {
      return checkMessageInitialized(
          parsePartialDelimitedFrom(input, extensionRegistry));
    }
  
    @Override
    public MessageType parseDelimitedFrom(InputStream input) throws InvalidProtocolBufferException {
      return parseDelimitedFrom(input, EMPTY_REGISTRY);
    }
  }
  